<style>
    * {
      box-sizing: border-box;
      margin: 0;
    }

    .container {
      width: 300px;
      background-color: pink;
      margin: 0 auto;
    }

    .one, .two {
      width: 100px;
      height: 100px;
      margin: 10px;
      background-color: black;
      border: none;
      display: inline-block;
    }
</style>

<div class='container'>
  <span>
    <div class='one'></div>
    <div class='two'></div>
  </span>
</div>